EP0754533A2 - Procédé pour traiter de la matière plastique - Google Patents

Procédé pour traiter de la matière plastique Download PDF

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Publication number
EP0754533A2
EP0754533A2 EP96110977A EP96110977A EP0754533A2 EP 0754533 A2 EP0754533 A2 EP 0754533A2 EP 96110977 A EP96110977 A EP 96110977A EP 96110977 A EP96110977 A EP 96110977A EP 0754533 A2 EP0754533 A2 EP 0754533A2
Authority
EP
European Patent Office
Prior art keywords
mold
plastic
closed
melt
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP96110977A
Other languages
German (de)
English (en)
Other versions
EP0754533A3 (fr
EP0754533B1 (fr
Inventor
Georg Steinbichler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Engel Maschinenbau GmbH
Original Assignee
Engel Maschinenbau GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Engel Maschinenbau GmbH filed Critical Engel Maschinenbau GmbH
Publication of EP0754533A2 publication Critical patent/EP0754533A2/fr
Publication of EP0754533A3 publication Critical patent/EP0754533A3/fr
Application granted granted Critical
Publication of EP0754533B1 publication Critical patent/EP0754533B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • B29C43/183—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles the preformed layer being a lining, e.g. shaped in the mould before compression moulding, or a preformed shell adapted to the shape of the mould
    • B29C43/184—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles the preformed layer being a lining, e.g. shaped in the mould before compression moulding, or a preformed shell adapted to the shape of the mould shaped by the compression of the material during moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/16—Making multilayered or multicoloured articles
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C45/1705—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles using movable mould parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1703—Introducing an auxiliary fluid into the mould
    • B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
    • B29C45/1711—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles and removing excess material from the mould cavity by the introduced fluid, e.g. to an overflow cavity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • B29C2043/023—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface having a plurality of grooves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • B29C2043/026—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface having functional projections, e.g. fasteners
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C2043/3205—Particular pressure exerting means for making definite articles
    • B29C2043/3222—Particular pressure exerting means for making definite articles pressurized gas, e.g. air
    • B29C2043/3227—Particular pressure exerting means for making definite articles pressurized gas, e.g. air inside the material, e.g. gas injection compression moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B29C2043/3613—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons applying pressure locally
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5875—Measuring, controlling or regulating the material feed to the moulds or mould parts, e.g. controlling feed flow, velocity, weight, doses
    • B29C2043/5883—Measuring, controlling or regulating the material feed to the moulds or mould parts, e.g. controlling feed flow, velocity, weight, doses ensuring cavity filling, e.g. providing overflow means

Definitions

  • the invention relates to a method for processing plastic, wherein the plastic is distributed without pressure over the lower mold half of a mold divided in a horizontal plane, then the mold is closed and, after the mold has been closed, pressed into a partial area of the mold, whereby after closing the mold, the mold cavity is initially completely filled with melt.
  • Injection molding usually works with pressures in the order of 50-100 bar, which are far below the usual injection pressure in the order of 350 bar, although the viscosity of the plastic is deliberately chosen to be high.
  • transfer molding it is not important to distribute the plastic as smoothly as possible, but it is important to essentially maintain the distribution of the plastic that was achieved before the mold was closed. In this sense, a low temperature of the melt and a considerable proportion of the plastic in long-fiber reinforcing materials is not a disadvantage.
  • the invention is based on the surprising finding that, even under the process conditions of transfer molding, it is possible first to fill the mold completely and then to displace part of the melt into a secondary cavity by means of a fluid.
  • the invention leads to a completely unexpected result, in particular when it comes to producing a large-area object which has an insert on the inside or on the surface and which is provided with reinforcing ribs. It is now possible to surround the insert with a first plastic and then to displace this plastic from the area of the ribs and in particular to replace it with a plastic reinforced by glass fibers.
  • a two-stage process is therefore proposed for the first time, in which an insert is back-pressed in the open form in a first process step and back-injected in the closed form in a second process step.
  • the underlying consideration is that after the initial pressing in of the insert, it is already protected against wrinkling to such an extent that the gentle pressing process can be dispensed with and the second plastic can be injected under the usual pressure of 50-350 bar. This pressure can be maintained during the cooling of the molded part, which, in contrast to the pressureless cooling during injection molding, prevents the molded part from shrinking.
  • the back-press technology can be used economically, especially for large molded parts.
  • a melt cake is inserted into a fully opened, vertical tool by a horizontally arranged movable injection unit 1 by means of a slot die 5 filed.
  • the plastic 16 can also be fed through the tool by means of a line 15.
  • the shaping is carried out and the connection with the decorative material is established. Due to the good pre-distribution, the melt only has to overcome short flow paths during the back-pressing process, which takes place by closing the tool halves 3, 4 by means of the clamping unit 2. Therefore, only low melt pressures are required to shape the molded part geometry.
  • the special feature of the method according to the invention is that it is used to produce moldings which have thickened portions 13 in the form of ribs or the like. For this purpose, more plastic is first applied to that area of the lower mold half 3, which is later to form the rib 13, than in the edge areas. As a result, when the mold, which is provided with a dipping edge 8, is closed, there is only slight movement of the melt relative to the textile insert 9. A fluid 7 is injected through a nozzle 7 into that part of the mold cavity 6 which later forms the rib 13 should. Since the mold cavity 6 is initially completely filled with melt, part of the melt is displaced by the gas into a secondary cavity 10. This secondary cavity 10 can be locked by a locking mechanism 12.
  • the fluid fed through the nozzle 7 is not a gas but a plastic which gives the rib 13 increased strength, for example because this plastic is mixed with glass fibers.
  • a plastic would be less suitable for the first process step, but its local use is unproblematic.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)
EP96110977A 1995-07-17 1996-07-08 Procédé pour traiter de la matière plastique Expired - Lifetime EP0754533B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT38795U 1995-07-17
AT387/95 1995-07-17
AT0038795U AT1126U1 (de) 1995-07-17 1995-07-17 Verfahren zum pressen von kunststoff

Publications (3)

Publication Number Publication Date
EP0754533A2 true EP0754533A2 (fr) 1997-01-22
EP0754533A3 EP0754533A3 (fr) 1997-03-19
EP0754533B1 EP0754533B1 (fr) 2002-03-27

Family

ID=3489249

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96110977A Expired - Lifetime EP0754533B1 (fr) 1995-07-17 1996-07-08 Procédé pour traiter de la matière plastique

Country Status (4)

Country Link
US (1) US5759476A (fr)
EP (1) EP0754533B1 (fr)
AT (2) AT1126U1 (fr)
DE (1) DE59608941D1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3004198B2 (ja) * 1995-11-14 2000-01-31 ユニプレス株式会社 複合成形品、その製造方法および製造装置
US6132669A (en) * 1997-08-14 2000-10-17 The Elizabeth And Sandor Valyi Foundation, Inc. Process for preparing a molded article
GB9820070D0 (en) * 1998-09-16 1998-11-11 Rover Group Improved moulding technique
US6346183B1 (en) 2000-08-03 2002-02-12 International Business Machines Corporation Use of thin carbon films as a bottom anti-reflective coating in manufacturing magnetic heads
AT410648B (de) * 2000-10-13 2003-06-25 Engel Austria Gmbh Vorrichtung zum spritzgiessen von kunststoff
ITGE20100013A1 (it) * 2010-02-01 2011-08-02 Renolit Ag Lastra con andamento tridimensionale provvista di strutture tridimensionali sporgenti e metodo per la sua realizzazione

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3865915A (en) * 1969-09-15 1975-02-11 Ici Ltd Injection moulding of complex shaped laminar articles
FR2257408B1 (fr) * 1973-09-25 1978-01-13 Billion Sa
FR2432137A1 (fr) * 1978-07-25 1980-02-22 Seima Procede pour la realisation de reflecteur optique et notamment pour projecteur d'automobile et machine pour sa mise en oeuvre
FR2624425B1 (fr) * 1987-12-15 1990-05-25 Plastic Omnium Cie Procede de surmoulage de feuilles non rigides par injection de matieres thermoplastiques pour realiser des pieces composites
DE3742457A1 (de) * 1987-12-15 1989-06-29 Dynamit Nobel Ag Herstellverfahren fuer kunststoff-formteile mit dekorativ-gepraegter oberflaechenbeschichtung
JP2537668B2 (ja) * 1988-09-19 1996-09-25 豊田合成株式会社 樹脂成形品の製造方法
DE3913109C5 (de) * 1989-04-21 2010-03-18 Ferromatik Milacron Maschinenbau Gmbh Verfahren zum Spritzgießen fluidgefüllter Kunststoffkörper und Vorrichtung zur Durchführung des Verfahrens
JP2791421B2 (ja) * 1989-10-05 1998-08-27 旭化成工業株式会社 中空型物の成形方法
IL93082A0 (en) * 1990-01-17 1990-11-05 Keter Plastic Ltd Method and system for moulding a hollow object
US5162092A (en) * 1990-11-29 1992-11-10 Cascade Engineering, Inc. Gas-assisted injection molding with a carpet layer
JP2976059B2 (ja) * 1991-02-08 1999-11-10 住友化学工業株式会社 中空成形品の製造方法
US5433910A (en) * 1991-05-14 1995-07-18 Toyoda Gosei Co., Ltd. Method of producing molding
GB2260932B (en) * 1991-10-22 1995-10-25 Honda Motor Co Ltd Molding apparatus for producing synthetic resin molded product
GB9214426D0 (en) * 1992-07-07 1992-08-19 Clearplas Ltd Applying surface coatings on moulded articles
JPH0671798A (ja) * 1992-08-27 1994-03-15 Sumitomo Chem Co Ltd 積層体
DE4240017C2 (de) * 1992-11-27 2001-03-15 Wolf Woco & Co Franz J Verfahren zur Herstellung von zumindest zweiseitig offenen hohlen Formteilen
JPH0784037B2 (ja) * 1993-05-11 1995-09-13 アァルピィ東プラ株式会社 合成樹脂製容器類の製法

Also Published As

Publication number Publication date
DE59608941D1 (de) 2002-05-02
EP0754533A3 (fr) 1997-03-19
EP0754533B1 (fr) 2002-03-27
AT1126U1 (de) 1996-11-25
ATE215009T1 (de) 2002-04-15
US5759476A (en) 1998-06-02

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